#include <bits/stdc++.h>
using namespace std;

#define ll long long

int main() {
	ll Y;
	cin >> Y;
	
	ll N;
	cin >> N;
	ll A[N];
	
	for (ll i = 0; i < N; i++) cin >> A[i];
	
	ll T;
	
	for (ll i = 0; i < N; i++) T += A[i];
	
	if (Y < T) cout << "red" << "\n";
	
	else cout << Y - T << "\n";
	
	return 0;
}